US4711067A - Method of packaging a single mattress to a small size to be conveniently carried - Google Patents

Method of packaging a single mattress to a small size to be conveniently carried Download PDF

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Publication number
US4711067A
US4711067A US06/724,034 US72403485A US4711067A US 4711067 A US4711067 A US 4711067A US 72403485 A US72403485 A US 72403485A US 4711067 A US4711067 A US 4711067A
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Prior art keywords
mattress
mandrel
cover
wrapper
rolling
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US06/724,034
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Giuliano Magni
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FRANCO MAGNI DINO
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Individual
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65BMACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B63/00Auxiliary devices, not otherwise provided for, for operating on articles or materials to be packaged
    • B65B63/02Auxiliary devices, not otherwise provided for, for operating on articles or materials to be packaged for compressing or compacting articles or materials prior to wrapping or insertion in containers or receptacles
    • B65B63/026Auxiliary devices, not otherwise provided for, for operating on articles or materials to be packaged for compressing or compacting articles or materials prior to wrapping or insertion in containers or receptacles for compressing by feeding articles through a narrowing space
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65BMACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B63/00Auxiliary devices, not otherwise provided for, for operating on articles or materials to be packaged
    • B65B63/02Auxiliary devices, not otherwise provided for, for operating on articles or materials to be packaged for compressing or compacting articles or materials prior to wrapping or insertion in containers or receptacles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65BMACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B63/00Auxiliary devices, not otherwise provided for, for operating on articles or materials to be packaged
    • B65B63/02Auxiliary devices, not otherwise provided for, for operating on articles or materials to be packaged for compressing or compacting articles or materials prior to wrapping or insertion in containers or receptacles
    • B65B63/024Auxiliary devices, not otherwise provided for, for operating on articles or materials to be packaged for compressing or compacting articles or materials prior to wrapping or insertion in containers or receptacles for compressing by winding

Definitions

  • the present invention relates to a method for individually packaging mattresses in such a way as to ensure ease of transport of the mattress and a small overall size thereof.
  • the invention also relates to an individual mattress package.
  • the present invention provides a method of individually packaging a mattress including the steps of inserting the mattress into a flexible and sealable wrapper, compressing the wrapped mattress by squeezing compression means to reduce the thickness of the mattress within limits compatible with the elastic structure of the mattress, and to remove air from the inside of the wrapper, thereafter sealing the wrapper, rolling up the squeezed and sealed mattress, stabilizing the rolled up shape, and placing the rolled mattress in a container therefor.
  • compression is produced by squeezing, and the remaining air is subsequently at least partially removed by suction with a suction or vacuum pump.
  • welding is effected without removal of air by suction, expulsion of the air with the press being sufficient.
  • the wrapper shall be air-tight, and it may be double, i.e. two wrappers one inside the other, welded separately or together for sealing purposes.
  • the welding of the wrapper may be effected after the removal of air by suction, or in two stages, a first stage effecting a partial closure and allowing air passage during the suction operations.
  • the stabilization of the rolled-up shape may be produced by the use of tapes, closing rings surrounding the rolled-up mattress, or with adhesive tape which may be disposed around the rolled-up mattress or, simply, as strips applied to the outside edge which extends longitudinally of the rolled-up mattress.
  • the method of packing to be described may be adopted for many types of mattresses, and particularly for those which have an intermediate layer of rubber or a synthetic elastic foam resin and, possibly, outer layers of artificial or natural fibres on the surfaces ensuring the comfort of the user.
  • a mattress of this type can resume its normal expanded, smooth shape within the space of a few hours after the wrapper which has kept it in a low vacuum has been torn off.
  • a preferred method includes the steps of: reducing the thickness of an elastic structure of the mattress by pressing and feeding means cantileverly projecting; fitting a cover on said structure and on said pressing means to complete the mattress, said cover comprising foam padding with inside film and a closure means; fitting a flexible and substantially air-tight wrapper on the outside of said cover; moving away the mattress with said cover and said wrapper from said pressing and feeding means; closing the cover by said closure means; flattening the mattress together with its cover and the flexible wrapper; inserting the flattened mattress between a rolling-up mandrel and a cylinder operating the compression by rolling and being elastically pushed toward said mandrel; rotating said mandrel and rolling-up on said mandrel said flattened mattress by compressing it by means of said cylinder which performs compression by rolling; circularly applying at least two adhesive ribbon-shaped strings at spaced apart positions around the rolled mattress in order to stabilize it; and axially withdrawing the mandrel from the rolled mattress and putting said mattress in a box-
  • the invention also includes a package for an individual mattress including an outer container, a mattress, a wrapper enclosing said mattress and sealingly holding said mattress in a compressed condition, and retaining means for holding said mattress and wrapper in a rolled-up configuration, said retained, rolled and wrapped mattress being received in said outer container.
  • a preferred package includes an outer container, a mattress, a wrapper enclosing said mattress, said mattress and said wrapper being in a compressed and rolled-up configuration, a ribbon-shaped film coupled to said mattress and rolled up at least partially together with said mattress and enveloping the rolled mattress with at least one convolution, and at least two retaining adhesive ribbon-shaped strings applied spaced apart and circularly around this outside convolution of said ribbon-shaped film and holding this convolution and therefore said mattress and wrapper in said rolled-up configuration, said rolled and enveloped mattress being received in said outer container.
  • the invention also includes an apparatus for packaging single mattresses.
  • Said apparatus includes: pressing and feeding means cantileverly projecting to reduce the thickness of said structure, the cover and the flexible wrapper being capable to fit on said means; squeezing compression means to flatten said mattress together with its cover and its flexible wrapper; a rolling-up and pressing device including axially sliding and rotating mandrel means, a compressing and rolling cylinder elastically urged towards said mandrel; means for feeding and applying at least two ribbon-shaped adhesive strings around the mattress in rolled configuration on said mandrel; and means for axially moving said mandrel means to withdraw them from said mattress being in rolled configuration.
  • FIG. 1 is a perspective view of a mattress inserted in its wrapper
  • FIG. 2 is a partial section through the wrapped mattress of FIG. 1,
  • FIG. 3 is a section through the mattress at an intermediate stage of compression
  • FIG. 4 is a perspective view of the mattress after compression
  • FIG. 5 is a partial cross-section of the mattress of FIG. 4,
  • FIG. 6 shows a stage on the rolling up of the flattened mattress
  • FIG. 7 is a perspective view of the rolled-up mattress
  • FIG. 8 shows the rolled-up mattress packed in its individual packing
  • FIGS. 9 and 10 show a side view and a plan view of a production plant
  • FIG. 11 shows a modified embodiment respect to FIG. 9,
  • FIG. 12 shows, in a perspective view, a finished mattress with removed parts
  • FIG. 13 shows, in a perspective view, a rolled-up mattress and a container for it
  • FIGS. 14 and 15 show a device for final pressing and rolling up, in schematic cross section and in a section taken along XI--XI of FIG. 14,
  • FIGS. 16 to 19 show schematic views similar to FIG. 15, in different successive configurations.
  • the mattress 1 is illustrated in its normal size and enclosed in an open wrapper 3 intended to house it.
  • the wrapper is mostly made of a film of synthetic airproof, weldable material, with a consistency adeguate to withstand the stresses it will be expected to undergo.
  • This wrapper 3 may also constitute a sheath for storing the re-expanded mattress at home.
  • the wrapper may be a double one.
  • the mattress 1 with its sheath 3 is placed in a press 5A, 5B, which is able to compress it from the normal size denoted by 1 through a size 1M to the squeezed size denoted by 1S. Squeezing is effected by mechanical action between the two parts 5A,5B of the press.
  • the wrapper 3 As the wrapper 3 is still at least partly open, the greater part of the air contained in the wrapper 3 is squeezed out.
  • the remaining air may be removed with a suction pump or a vacuum pump from the wrapper 3 to a degree of vacuum kept within the reasonable limits for the purposes mentioned.
  • the wrapper 3 is sealed, and thereafter the mattress remains squeezed inside the wrapper without any possibility of re-expansion.
  • the mattress thus squeezed and secured inside the wrapper is then relatively tightly rolled up as shown at 7, until the shape shown at 9 is reached.
  • This shape is stabilized with the application of means for holding the outside edge 9A of the mattress and its wrapper.
  • These retaining means may be represented by two or more pieces 10 of relatively strong adhesive tape, applied transversely and facing the edge 9A.
  • the squeezed mattress assumes a very limited and compact overall size and may therefore be inserted in a container 12 which may be cylindrical or parallelepipedic.
  • This container is not intended to withstand a thrust from the inside towards the outside of the squeezed and rolled-up mattress which is stabilized by the retaining means 10.
  • the container 12 may be of cardboard or synthetic resin, formed in the shape of a box, a cube or other shape, to be opened at the end or longitudinally.
  • the container of this type may be advantageously fitted with a handle 14 for ease of transport in a horizontal position. It will be appreciated that various types, shapes and constructions are possible for such a container 12.
  • the mattress held by the retaining means may be in such a condition as to no longer require the low vacuum conditions.
  • FIGS. 9 and 10 a plant is shown for carrying out an intermittent working.
  • An equipment 21, per se known, presents a conveyor 23 on which the elastic mass M3 to be packaged may be laid down; the conveyor 23 inserts the mass M3 between two sets of arms 25,27 combined with conveyors and mounted on the equipment 21 so that they can be displaced parallel to themselves according to arrows fX to get closer between them and, in opposite direction, to be moved apart.
  • the mass M3, when it has been inserted between the arms 25 and 27, is pressed to some extent as indicated by M5 to have its thickness reduced.
  • a cover C complete with padding and opened in correspondence of a mouth being provided with a continuous closure system L, like a so-called "zip" closure; this mouth and this closure L extend along one of the minor end fronts of the cover C and, in part, along the major sides as shown in FIG. 12; the cover C comprises also foam padding with an inside film.
  • a continuous closure system L like a so-called "zip" closure; this mouth and this closure L extend along one of the minor end fronts of the cover C and, in part, along the major sides as shown in FIG. 12; the cover C comprises also foam padding with an inside film.
  • a flexible and substantially air-tight wrapper P developed as an open sack, may be fit on the cover C; this wrapper being realizable by thermoplastic film.
  • the elastic mass M5 is fed according to arrow f7 together with the cover C and the wrapper P by the advancement means combined with the arms 25,27 and also by the operator's intervention, until the assembly reaches the position M7 to rest upon a work plane 31 adjacent to the equipment 21. During the dwell on this work plane 31, the operator closes the cover C by means of the closure L.
  • the arms 25,27 may be provided with nozzles for the distribution of adhesive during the advancement of the assembly from position M5 to position M7 in order to make the inside surface of the cover C adhere on to the mass M7.
  • a compression means 33 follows for flattening the mattress together with its cover C and the wrapper P.
  • This compression means includes a lower plane 35, preferably fixed, and an upper plane 37 displaceable according to the dual arrow f9 in order to lower and to press and flatten the mattress and also to be lifted therefrom.
  • the compression means 33 reduces the thickness of the mattress to the configuration M7, causing the air outlet from the wrapper P.
  • the upper plane 37 is raised, even if the wrapper P has not been closed, the mattress does not tend to rapidly expand, because the air is prevented from penetrating the wrapper P owing to its substantial impermeability; the air can only enter very slowly the wrapper P in case this is not welded along the opening.
  • the compression means 33 may be also combined with a welding system 39,41 which, after the lowering of the upper plane 37 and the air outlet from the wrapper P, may be actuated to operate the welding.
  • a rolling-up and pressing device follows, generally indicated by 45 and better illustrated in FIGS. 14 to 19, in which the mattress, being in the configuration M7, is fed to be packaged in a more squeezed and rolled-up condition.
  • FIG. 11 a modified embodiment respect to FIGS. 9 and 10 is illustrated; in this embodiment, downstream and at a limited distance from the equipment 21, a compression means 133 is provided which operates in a continuous way rather than in an intermittent way like the compression means 33.
  • the compression means comprises two sets of lower rollers 135 and of upper rollers 137 which are advantageously associated with respective belt means 139,141, and are disposed together with them so as to result gradually closer and closer in the direction of arrow f133 of the assembly advancement.
  • the mattress assembly, pushed out of the arms 25,27, may be slided on a short linking conveyor 143 and then delivered between the belt means 139,141, where this assembly is compressed during its advancement according to arrow f133.
  • the welding system may be excluded, or a welding system 145,147 may be provided at the exit from the compression means 133.
  • the assembly being flattened into the configuration M7 by the compression means 133, can reach the rolling-up and pressing device 45, where the mattress is packed in an even more squeezed and rolled condition.
  • a housing of said device comprises side frame 201 and supports 203 external to them for cylinder-piston systems 205; these systems serve to axially driving two opposite stems 207 which form two semimandrels each capable of sliding according to arrows f207 to axially move away from each other up the outside of the two side frames and in the reverse direction to approach to each other in order to make up a mandrel between the two side frames 201; the facing ends of the two semi-mandrels are so shaped as to cooperate when they are coupled.
  • the two semi-mandrels are capable of rotating around their respective axis.
  • Each semi-mandrel 207 is internally hollow to form a suction chamber through the holes 209 distributed along each semi-mandrel.
  • two jacks 211 are provided whose mobile parts 211A control the displacement of a shaft 213 for a compression and rolling cylinder 215; this cylinder 215 is located between the two side frames and is guided by means of supports 217 along guides 219 formed in the respective side frames.
  • the cylinder 215 may be approached towards and urged, according to arrow f215, against the mandrel formed by the two semi-mandrels 207; by a reverse drive, opposite to arrow f215, the cylinder 215 may be moved away from the mandrel.
  • the cylinder 215 is mostly capable of rotating idly, but it could be possibly driven to rotate in a direction opposite to that of the semi-mandrels 207.
  • a reservoir-spool 220 feeds a ribbon-shaped film 222, which is passed through guide means 224 located in the vicinity of the cylinder 215.
  • the end of the film 222 may be approached to the mandrel formed by the coupled semi-mandrels 207, when the cylinder is lifted (FIG. 15) and when a vacuum has been created inside the two semi-mandrels.
  • the end of the film 222 can thus be made to adhere by pneumatic suction against the mandrel.
  • This mandrel can be rotated according to arrow f207 just before the assembly--which has been pressed by the compression and flattening means 33 or 133--is approached to it, and immediately after the film 222 has been pneumatically engaged against the mandrel.
  • the assembly being flattened by the means 33 or 133 is inserted between the cylinder 215 and the mandrel made up of the two coupled and rotating semi-mandrels 207 (FIG. 16) in order to start to be squeezed and rolled up (FIG. 17) together with the film 222 which results in contact with the cylinder 215.
  • the squeezed and flattened mattress is made to assume a rolled-up configuration while the air still present in the flattened mattress is progressively driven toward the open or welded end of the wrapper P; at the end of the rolling-up (FIG. 18), the wrapper P may be even torn off by the air if the latter does not find some exit opening.
  • the rolling-up proceeds with the film 222 only, to form at least one outside convolution 222A surrounding the rolled mattress (FIG. 19).
  • a mechanically or even manually operated cutting means cuts the film 222 and the end stretch of the film which has been rolled up together with the mattress is laid down on the outside convolution 222A.
  • three adhesive ribbon-shaped strings 230 are applied which are annularly disposed around the rolled mattress to stabilize the configuration of the outside convolution 222A of the ribbon-shaped film.
  • small machines 232 may be utilized of a type normally available on the market.
  • a single small machine can be utilized by the operator for the three consecutive operations for the application of the three ribbon-shaped strings 230, while the assembly continues to rotate on the mandrel.
  • a mobile equipment may also be provided carrying three machines 232 and which can approach them simultaneously to the rolled assembly rotating on the mandrel, for the simultaneous application of the three strings.
  • the rolling up may be also operated starting without the film 222 and by inserting it during the rolling up, or even without using the film and applying the ribbon-shaped strings on the wrapper P.
  • the mattress removed from the container may be released from the means 10 and stretched out, and the wrapper 3 may be opened in such a manner as to allow the entry of air and thus permit the re-expansion of the mattress which, more or less speedily, resumes the thickness intended for use.
  • Mattresses packed as indicated above may be stored for shipment and warehousing in a relatively very economic manner, and are saleable individually also in the packed presentation, as a result of which the final user can conveniently carry the mattress purchased with the means at his own disposal, without difficulty or extra expense.
  • a mattress is obtained, which is able to re-expand in a very regular way, although being packed in a very squeezed configuration. This is, at least in part, due to the gradual compression in subsequent times, and to the way in which the compressions are carried out.
  • the components are stabilized in their mutual position, owing both to the structure of the wrapper combined with a padding and to the possibility of gluing the mass M to the wrapper.

Abstract

The packaging method includes the steps of inserting a single mattress into a flexible and waterproof wrapper, compressing by squeezing with compressing means to reduce the thickness of the mattress within limits compartible with the elastic structure of the actual mattress, and driving out the air from inside the wrapper; welding the wrapper to seal it and then rolling up the squeezed whole obtained to give it a stable shape. The finished item is placed in a container or case suitable for offering the item for sale.

Description

This application is a continuation-in-part of application Ser. No. 576,709, filed 2-3-84 now abandoned.
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates to a method for individually packaging mattresses in such a way as to ensure ease of transport of the mattress and a small overall size thereof. The invention also relates to an individual mattress package.
2. Prior Art
Methods are known for the packing of spring mattresses or other modern type mattresses made with synthetic resin foam and other materials, providing for the reduction of thickness of the mattress and fixing the squeezed shape of the mattress for the simultaneous despatch of a plurality of mattresses. In the majority of cases a stack of mattresses is compressed to reduce its height and the mattresses are secured in their squeezed shape with mechanical means such as straps or resistant wrappers. It is thus possible, within a restricted space, for example in a container, to despatch a plurality of mattresses to the point of sale, while the final user is supplied with a mattress that has again expanded.
There exist a number of systems for the reduction of the volume of pillows and the like by suction and low vacuum in a container containing a single pillow or cushion. A system of this kind cannot be adapted to the single mattress, because of technical and economic difficulties.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a method of packing an individual mattress so that it occupies a small space for storage and also for the convenience of the final purchaser in carrying the mattress home.
The present invention provides a method of individually packaging a mattress including the steps of inserting the mattress into a flexible and sealable wrapper, compressing the wrapped mattress by squeezing compression means to reduce the thickness of the mattress within limits compatible with the elastic structure of the mattress, and to remove air from the inside of the wrapper, thereafter sealing the wrapper, rolling up the squeezed and sealed mattress, stabilizing the rolled up shape, and placing the rolled mattress in a container therefor.
In a preferred method compression is produced by squeezing, and the remaining air is subsequently at least partially removed by suction with a suction or vacuum pump. In other methods, welding is effected without removal of air by suction, expulsion of the air with the press being sufficient.
The wrapper shall be air-tight, and it may be double, i.e. two wrappers one inside the other, welded separately or together for sealing purposes.
The welding of the wrapper may be effected after the removal of air by suction, or in two stages, a first stage effecting a partial closure and allowing air passage during the suction operations.
The stabilization of the rolled-up shape may be produced by the use of tapes, closing rings surrounding the rolled-up mattress, or with adhesive tape which may be disposed around the rolled-up mattress or, simply, as strips applied to the outside edge which extends longitudinally of the rolled-up mattress.
The method of packing to be described may be adopted for many types of mattresses, and particularly for those which have an intermediate layer of rubber or a synthetic elastic foam resin and, possibly, outer layers of artificial or natural fibres on the surfaces ensuring the comfort of the user. A mattress of this type can resume its normal expanded, smooth shape within the space of a few hours after the wrapper which has kept it in a low vacuum has been torn off.
A preferred method includes the steps of: reducing the thickness of an elastic structure of the mattress by pressing and feeding means cantileverly projecting; fitting a cover on said structure and on said pressing means to complete the mattress, said cover comprising foam padding with inside film and a closure means; fitting a flexible and substantially air-tight wrapper on the outside of said cover; moving away the mattress with said cover and said wrapper from said pressing and feeding means; closing the cover by said closure means; flattening the mattress together with its cover and the flexible wrapper; inserting the flattened mattress between a rolling-up mandrel and a cylinder operating the compression by rolling and being elastically pushed toward said mandrel; rotating said mandrel and rolling-up on said mandrel said flattened mattress by compressing it by means of said cylinder which performs compression by rolling; circularly applying at least two adhesive ribbon-shaped strings at spaced apart positions around the rolled mattress in order to stabilize it; and axially withdrawing the mandrel from the rolled mattress and putting said mattress in a box-like container.
The invention also includes a package for an individual mattress including an outer container, a mattress, a wrapper enclosing said mattress and sealingly holding said mattress in a compressed condition, and retaining means for holding said mattress and wrapper in a rolled-up configuration, said retained, rolled and wrapped mattress being received in said outer container.
A preferred package includes an outer container, a mattress, a wrapper enclosing said mattress, said mattress and said wrapper being in a compressed and rolled-up configuration, a ribbon-shaped film coupled to said mattress and rolled up at least partially together with said mattress and enveloping the rolled mattress with at least one convolution, and at least two retaining adhesive ribbon-shaped strings applied spaced apart and circularly around this outside convolution of said ribbon-shaped film and holding this convolution and therefore said mattress and wrapper in said rolled-up configuration, said rolled and enveloped mattress being received in said outer container.
The invention also includes an apparatus for packaging single mattresses. Said apparatus includes: pressing and feeding means cantileverly projecting to reduce the thickness of said structure, the cover and the flexible wrapper being capable to fit on said means; squeezing compression means to flatten said mattress together with its cover and its flexible wrapper; a rolling-up and pressing device including axially sliding and rotating mandrel means, a compressing and rolling cylinder elastically urged towards said mandrel; means for feeding and applying at least two ribbon-shaped adhesive strings around the mattress in rolled configuration on said mandrel; and means for axially moving said mandrel means to withdraw them from said mattress being in rolled configuration.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a mattress inserted in its wrapper,
FIG. 2 is a partial section through the wrapped mattress of FIG. 1,
FIG. 3 is a section through the mattress at an intermediate stage of compression,
FIG. 4 is a perspective view of the mattress after compression,
FIG. 5 is a partial cross-section of the mattress of FIG. 4,
FIG. 6 shows a stage on the rolling up of the flattened mattress,
FIG. 7 is a perspective view of the rolled-up mattress,
FIG. 8 shows the rolled-up mattress packed in its individual packing,
FIGS. 9 and 10 show a side view and a plan view of a production plant,
FIG. 11 shows a modified embodiment respect to FIG. 9,
FIG. 12 shows, in a perspective view, a finished mattress with removed parts,
FIG. 13 shows, in a perspective view, a rolled-up mattress and a container for it,
FIGS. 14 and 15 show a device for final pressing and rolling up, in schematic cross section and in a section taken along XI--XI of FIG. 14,
FIGS. 16 to 19 show schematic views similar to FIG. 15, in different successive configurations.
DESCRIPTION OF PREFERRED EMBODIMENTS
The mattress 1 is illustrated in its normal size and enclosed in an open wrapper 3 intended to house it. The wrapper is mostly made of a film of synthetic airproof, weldable material, with a consistency adeguate to withstand the stresses it will be expected to undergo. This wrapper 3 may also constitute a sheath for storing the re-expanded mattress at home. The wrapper may be a double one. The mattress 1 with its sheath 3 is placed in a press 5A, 5B, which is able to compress it from the normal size denoted by 1 through a size 1M to the squeezed size denoted by 1S. Squeezing is effected by mechanical action between the two parts 5A,5B of the press. During the pressing operation, as the wrapper 3 is still at least partly open, the greater part of the air contained in the wrapper 3 is squeezed out. Immediately after pressing, and before the action of the press has been stopped and, anyhow, before a re-expansion of the mattress, the remaining air may be removed with a suction pump or a vacuum pump from the wrapper 3 to a degree of vacuum kept within the reasonable limits for the purposes mentioned.
At the end of the squeezing and the desired suction operations, the wrapper 3 is sealed, and thereafter the mattress remains squeezed inside the wrapper without any possibility of re-expansion.
The mattress thus squeezed and secured inside the wrapper is then relatively tightly rolled up as shown at 7, until the shape shown at 9 is reached. This shape is stabilized with the application of means for holding the outside edge 9A of the mattress and its wrapper. These retaining means may be represented by two or more pieces 10 of relatively strong adhesive tape, applied transversely and facing the edge 9A.
In the presentation shown at 9 the squeezed mattress assumes a very limited and compact overall size and may therefore be inserted in a container 12 which may be cylindrical or parallelepipedic. This container is not intended to withstand a thrust from the inside towards the outside of the squeezed and rolled-up mattress which is stabilized by the retaining means 10. The container 12 may be of cardboard or synthetic resin, formed in the shape of a box, a cube or other shape, to be opened at the end or longitudinally. The container of this type may be advantageously fitted with a handle 14 for ease of transport in a horizontal position. It will be appreciated that various types, shapes and constructions are possible for such a container 12.
After having been rolled up, the mattress held by the retaining means may be in such a condition as to no longer require the low vacuum conditions.
In FIGS. 9 and 10 a plant is shown for carrying out an intermittent working. An equipment 21, per se known, presents a conveyor 23 on which the elastic mass M3 to be packaged may be laid down; the conveyor 23 inserts the mass M3 between two sets of arms 25,27 combined with conveyors and mounted on the equipment 21 so that they can be displaced parallel to themselves according to arrows fX to get closer between them and, in opposite direction, to be moved apart. The mass M3, when it has been inserted between the arms 25 and 27, is pressed to some extent as indicated by M5 to have its thickness reduced. Under such conditions it is easy to fit on the unit, made up of arms 25,27 and on the mass M5, a cover C complete with padding and opened in correspondence of a mouth being provided with a continuous closure system L, like a so-called "zip" closure; this mouth and this closure L extend along one of the minor end fronts of the cover C and, in part, along the major sides as shown in FIG. 12; the cover C comprises also foam padding with an inside film.
Together with the cover C or immediately after, a flexible and substantially air-tight wrapper P, developed as an open sack, may be fit on the cover C; this wrapper being realizable by thermoplastic film.
The elastic mass M5 is fed according to arrow f7 together with the cover C and the wrapper P by the advancement means combined with the arms 25,27 and also by the operator's intervention, until the assembly reaches the position M7 to rest upon a work plane 31 adjacent to the equipment 21. During the dwell on this work plane 31, the operator closes the cover C by means of the closure L. The arms 25,27 may be provided with nozzles for the distribution of adhesive during the advancement of the assembly from position M5 to position M7 in order to make the inside surface of the cover C adhere on to the mass M7.
After the work plane 31, a compression means 33 follows for flattening the mattress together with its cover C and the wrapper P. This compression means includes a lower plane 35, preferably fixed, and an upper plane 37 displaceable according to the dual arrow f9 in order to lower and to press and flatten the mattress and also to be lifted therefrom. The compression means 33 reduces the thickness of the mattress to the configuration M7, causing the air outlet from the wrapper P. When the upper plane 37 is raised, even if the wrapper P has not been closed, the mattress does not tend to rapidly expand, because the air is prevented from penetrating the wrapper P owing to its substantial impermeability; the air can only enter very slowly the wrapper P in case this is not welded along the opening. The compression means 33 may be also combined with a welding system 39,41 which, after the lowering of the upper plane 37 and the air outlet from the wrapper P, may be actuated to operate the welding.
After the compression means 33, a rolling-up and pressing device follows, generally indicated by 45 and better illustrated in FIGS. 14 to 19, in which the mattress, being in the configuration M7, is fed to be packaged in a more squeezed and rolled-up condition.
In FIG. 11 a modified embodiment respect to FIGS. 9 and 10 is illustrated; in this embodiment, downstream and at a limited distance from the equipment 21, a compression means 133 is provided which operates in a continuous way rather than in an intermittent way like the compression means 33. As can be seen in FIG. 11, the compression means comprises two sets of lower rollers 135 and of upper rollers 137 which are advantageously associated with respective belt means 139,141, and are disposed together with them so as to result gradually closer and closer in the direction of arrow f133 of the assembly advancement. The mattress assembly, pushed out of the arms 25,27, may be slided on a short linking conveyor 143 and then delivered between the belt means 139,141, where this assembly is compressed during its advancement according to arrow f133. During the passage between arms 25,27 and the compression means 133, an operator will have enough time to operate the closing of cover C by means of the closure L. In this embodiment, the welding system may be excluded, or a welding system 145,147 may be provided at the exit from the compression means 133. The assembly, being flattened into the configuration M7 by the compression means 133, can reach the rolling-up and pressing device 45, where the mattress is packed in an even more squeezed and rolled condition.
In FIGS. 14 to 19 the rolling and pressing device 45 is illustrated in more details than in the preceding figures but, again, in a schematic way. A housing of said device comprises side frame 201 and supports 203 external to them for cylinder-piston systems 205; these systems serve to axially driving two opposite stems 207 which form two semimandrels each capable of sliding according to arrows f207 to axially move away from each other up the outside of the two side frames and in the reverse direction to approach to each other in order to make up a mandrel between the two side frames 201; the facing ends of the two semi-mandrels are so shaped as to cooperate when they are coupled. The two semi-mandrels are capable of rotating around their respective axis. Each semi-mandrel 207 is internally hollow to form a suction chamber through the holes 209 distributed along each semi-mandrel. On the two side frames 201, two jacks 211 are provided whose mobile parts 211A control the displacement of a shaft 213 for a compression and rolling cylinder 215; this cylinder 215 is located between the two side frames and is guided by means of supports 217 along guides 219 formed in the respective side frames. By means of the two jacks 211, the cylinder 215 may be approached towards and urged, according to arrow f215, against the mandrel formed by the two semi-mandrels 207; by a reverse drive, opposite to arrow f215, the cylinder 215 may be moved away from the mandrel. The cylinder 215 is mostly capable of rotating idly, but it could be possibly driven to rotate in a direction opposite to that of the semi-mandrels 207.
A reservoir-spool 220 feeds a ribbon-shaped film 222, which is passed through guide means 224 located in the vicinity of the cylinder 215. The end of the film 222 may be approached to the mandrel formed by the coupled semi-mandrels 207, when the cylinder is lifted (FIG. 15) and when a vacuum has been created inside the two semi-mandrels. The end of the film 222 can thus be made to adhere by pneumatic suction against the mandrel. This mandrel can be rotated according to arrow f207 just before the assembly--which has been pressed by the compression and flattening means 33 or 133--is approached to it, and immediately after the film 222 has been pneumatically engaged against the mandrel. By approaching the cylinder 215, the assembly being flattened by the means 33 or 133 is inserted between the cylinder 215 and the mandrel made up of the two coupled and rotating semi-mandrels 207 (FIG. 16) in order to start to be squeezed and rolled up (FIG. 17) together with the film 222 which results in contact with the cylinder 215. The squeezed and flattened mattress is made to assume a rolled-up configuration while the air still present in the flattened mattress is progressively driven toward the open or welded end of the wrapper P; at the end of the rolling-up (FIG. 18), the wrapper P may be even torn off by the air if the latter does not find some exit opening. The rolling-up proceeds with the film 222 only, to form at least one outside convolution 222A surrounding the rolled mattress (FIG. 19). At this point, a mechanically or even manually operated cutting means cuts the film 222 and the end stretch of the film which has been rolled up together with the mattress is laid down on the outside convolution 222A. At this point, to the outside convolution 222A of the ribbon-shaped film 222, three adhesive ribbon-shaped strings 230 are applied which are annularly disposed around the rolled mattress to stabilize the configuration of the outside convolution 222A of the ribbon-shaped film. In order to apply the ribbon-shaped strings 230, small machines 232 may be utilized of a type normally available on the market. A single small machine can be utilized by the operator for the three consecutive operations for the application of the three ribbon-shaped strings 230, while the assembly continues to rotate on the mandrel. A mobile equipment may also be provided carrying three machines 232 and which can approach them simultaneously to the rolled assembly rotating on the mandrel, for the simultaneous application of the three strings.
After the ribbon-shaped strings 230 have been applied, while the suction through the holes 209 of the semi-mandrels has stopped, said semi-mandrels stop rotating and are axially moved away from each other according to arrows f207. In this way, the semi-mandrels 207 withdraw from the inside of the mattress which is rolled up and packed by the film 222, the outside convolution 222A and the strings 230. Thus, the packed mattress can be moved away and placed in the container 236 or otherwise packaged.
It should be noted that after the packaging by the outside convolution 222A of the ribbon-shaped film 222, and after the application of strings 230, the mattress is no longer able to expand itself by sucking air, even if the wrapper P results torn off or not completely air-tight.
The rolling up may be also operated starting without the film 222 and by inserting it during the rolling up, or even without using the film and applying the ribbon-shaped strings on the wrapper P.
The mattress removed from the container may be released from the means 10 and stretched out, and the wrapper 3 may be opened in such a manner as to allow the entry of air and thus permit the re-expansion of the mattress which, more or less speedily, resumes the thickness intended for use.
Mattresses packed as indicated above may be stored for shipment and warehousing in a relatively very economic manner, and are saleable individually also in the packed presentation, as a result of which the final user can conveniently carry the mattress purchased with the means at his own disposal, without difficulty or extra expense.
With the above described method a mattress is obtained, which is able to re-expand in a very regular way, although being packed in a very squeezed configuration. This is, at least in part, due to the gradual compression in subsequent times, and to the way in which the compressions are carried out. The components are stabilized in their mutual position, owing both to the structure of the wrapper combined with a padding and to the possibility of gluing the mass M to the wrapper.

Claims (13)

I claim:
1. A method of individually forming and packaging a mattress, including the steps of:
reducing the thickness of an elastic structure of the mattress by pressing and feeding means cantileverly projecting;
fitting a cover on said structure and on said pressing means to complete the mattress, said cover comprising foam padding with inside film and a closure means;
fitting a flexible and substantially air-tight wrapper on the outside of said cover;
moving away the mattress with said cover and said wrapper from said pressing and feeding means;
closing the cover by said closure means;
flattening the mattress together with its cover and the flexible wrapper;
engaging a ribbon-shaped film to a rolling-up mandrel arranged to cooperate with a cylinder operating the compression by rolling and being elastically pushed toward said mandrel;
inserting the flattened mattress between said mandrel and said compressing cylinder;
rotating said mandrel and rolling up on said mandrel said ribbon-shaped film and said flattened mattress by compressing it by means of said cylinder which performs compression by rolling;
continuing the rolling up of said ribbon-shaped film for at least a convolution around the mattress being rolled-up on the mandrel and cutting said film;
circularly applying at least two adhesive ribbon-shaped strings at spaced apart positions on said at least one convolution of ribbon-shaped film around the rolled mattress in order to stabilize it;
axially withdrawing the mandrel from the rolled mattress and putting said mattress in a box-like container.
2. A method according to claim 1, in which the step of flattening the mattress with its cover and flexible wrapper is actuated by making the mattress stand by in a plane press.
3. A method according to claim 1, in which the step of flattening the mattress with its cover and flexible wrapper is carried out by passing the mattress between two continuous belt systems with the opposite facing branches gradually coming closer to each other.
4. A method according to claim 1, further comprising the step of closing the mouth of the flexible wrapper by welding.
5. A method of individually forming and packaging a mattress, including the steps of:
reducing the thickness of an elastic structure of the mattress by pressing and feeding means cantileverly projecting;
fitting a cover on said structure and on said pressing means to complete the mattress, said cover comprising foam padding with inside film and a closure means;
fitting a flexible and substantially air-tight wrapper on the outside of said cover;
moving away the mattress with said cover and said wrapper from said pressing and feeding means;
closing the cover by said closure means;
flattening the mattress together with its cover and the flexible wrapper;
inserting the flattened mattress between a rolling-up mandrel and a cylinder operating the compression by rolling and being elastically pushed toward said mandrel;
rotating said mandrel and rolling-up on said mandrel said flattened mattress by compressing it by means of said cylinder which performs compression by rolling;
inserting a ribbon-shaped film between said cylinder and the mattress during the rolling-up;
continuing the rolling up of said ribbon-shaped film for at least a convolution around the mattress being rolled-up on the mandrel and cutting said film;
circularly applying at least two adhesive ribbon-shaped strings at spaced apart positions on said at least one convolution of ribbon-shaped film around the rolled mattress in order to stabilize it;
axially withdrawing the mandrel from the rolled mattress and putting said mattress in a box-like container.
6. A method of individually forming and packaging a mattress, including the steps of:
reducing the thickness of an elastic structure of the mattress by pressing and feeding means cantileverly projecting;
fitting a cover on said structure and on said pressing means to complete the mattress, said cover comprising foam padding with inside film and a closure means;
fitting a flexible and substantially air-tight wrapper on the outside of said cover;
moving away the mattress with said cover and said wrapper from said pressing and feeding means;
closing the cover by said closure means;
flattening the mattress together with its cover and the flexible wrapper;
inserting the flattened mattress between a rolling-up mandrel and a cylinder operating (the compression) to compress the mattress by rolling and being elastically pushed toward said mandrel;
rotating said mandrel and rolling-up on said mandrel said flattened mattress by compressing it by means of said cylinder which performs compression by rolling;
circularly applying at least two adhesive ribbon-shaped strings at spaced apart positions around the rolled mattress in order to stablize it;
axially withdrawing the mandrel from the rolled mattress and putting said mattress in a box-like container.
7. An apparatus for packaging single mattresses including a structure elastically compressible, a cover with an opening provided with a closure means, and a flexible and substantially air-tight wrapper, said apparatus including:
pressing and feeding means cantileverly projecting to reduce the thickness of said structure and feed said structure within the cover and flexible wrapper, the cover and the flexible wrapper being capable to fit on said means;
squeezing compression means to flatten said mattress together with its cover and its flexible wrapper;
a rolling up and pressing device including axially sliding and rotating mandrel means, on said mandrel means being provided for gripping a ribbon-shaped film, a compressing and rolling cylinder elastically urged towards said mandrel, and means for feeding said ribbon-shaped film for rolling it together with the flattened mattress;
means for feeding and applying at least two ribbon-shaped adhesive strings around the mattress in rolled configuration on said mandrel; and
means for axially moving said mandrel means to withdraw them from said mattress being in rolled configuration.
8. An apparatus according to claim 7, in which said mandrel means include two semi-mandrels matchable in an axial alignment, and in which each semi-mandrel is associated with a respective drive means for axially moving each semi-mandrel in order to withdraw it from said mattress being in rolled configuration.
9. An apparatus according to claim 7, in which said squeezing compression means for flattening the mattress are plane press means.
10. An apparatus according to claim 7, in which said squeezing compression means for flattening the mattress include two sets of rollers and continuous belts, with respective active branches according to a mutual arrangement of progressively coming closer to each other.
11. An apparatus according to claim 7, further including means for welding said flexible and substantially air-tight wrapper, said means being associated to the squeezing compression means which flatten the mattress.
12. An apparatus according to claim 7, in which said means for gripping said ribbon-shaped film are means of pneumatic suction inside said mandrel means and include suction holes along said mandrel means.
13. An apparatus for packaging single mattresses including a structure elastically compressible, a cover with an opening provided with a closure means, and a flexible and substantially air-tight wrapper, said apparatus including:
pressing and feeding means cantileverly projecting to reduce the thickness of said structure and feed said structure within the cover and flexible wrapper, the cover and flexible wrapper being capable to fit on said means;
squeezing compression means to flatten said mattress together with its cover and its flexible wrapper;
a rolling up and pressing device including axially sliding and rotating mandrel means, a compressing and rolling cylinder elastically urged towards said mandrel;
means for feeding and applying at least two ribbon-shaped adhesive strings around the mattress in rolled configuration on said mandrel; and
means for axially moving said mandrel means to withdraw them from said mattress being in rolled configuration.
US06/724,034 1984-02-03 1985-04-16 Method of packaging a single mattress to a small size to be conveniently carried Expired - Lifetime US4711067A (en)

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